Okay sweet I got : 4x^3-480=0
4x^3=480
x^3=120
x= 3 root 120 = 4.9...
Thanks alot btw, but how do I choose what to multiply by if this was another q in an exam with different multiples...? Thanks though!!

(Original post by alex7892)
Okay sweet I got : 4x^3-480=0
4x^3=480
x^3=120
x= 3 root 120 = 4.9...
Thanks alot btw, but how do I choose what to multiply by if this was another q in an exam with different multiples...? Thanks though!!

Well it's better to get rid of the fractions or negative power (by this I mean or ). So multiply by whatever you need to get rid of the negative power.